On the server-side, you'll need
to enforce SAML authentication for REST API, using one of the methods described in Configuring SAML SSO for REST
API. For example, you can set
saml.sp.isEnforced=true in the
alfresco-global.properties file.

Note: If you install the Outlook client manually without specifying the SAML
authentication type, you won't be able to see or select the SAML option.

Once you've installed the Outlook client and completed the configuration, you should see
the SAML authentication radio button in the Outlook plugin configuration. To see this
option, open Microsoft Outlook, and in the Alfresco Client tab
select Configure to view the client configuration

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